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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2975c3a7e7c6a54cc96243176bacf1594b9070a2dc14b910ca4a66c93c40426' 
  AND token = 'NoWfLq6KojGEJrfa9HBgQIhU17dnnhairNZ4DDHmn+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}